Question
When designing OSPF networks; what is the purpose of using a hierarchical design? (Select all choices that apply)

A. To reduce the complexity of router configuration


B. To speed up convergence


C. To confine network instability to single areas of the network


D. To reduce routing overhead


E. To lower costs by replacing routers


F. To decrease latency
Answers
B, C, D
Explanation:
An OSPF network designed in a hierarchical fashion with different areas is used because a small change in the topology of a single area won't force every router to run the SPF algorithm. Changes in one area are limited to that area only, not to every router within the entire network. Confining the topology changes to one area reduces the overhead and speeds the convergence of the network. Reference: CCNA Self-Study CCNA ICND exam certification Guide (Cisco Press, ISBN 1-58720-083-X) Page 194
Incorrect Answers:


A. This choice is incorrect because a hierarchical design actually adds complexity to the router configuration.

E. This is incorrect because a hierarchical design will not eliminate the need for routers. In fact, segmenting the network into multiple areas may actually require the use of additional routers.

F. The use of a hierarchical design will in no way reduce the latency involved. If additional routers are implemented in order to segment the network into additional areas, then the latency involved may actually increase.   Your Comment




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